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在会同林区采用３种不同连栽杉木次数的土壤，进行杉木幼树盆栽试验．结果表明，杉木连栽不利其幼树生长．连裁使幼树高生长下降３７—４０％，基径下降１９—２８％，冠幅下降２１—２９％，总生物量减少４５—５０％．杉木连栽还造成土壤养分递减，即腐殖质减少７—２８％，速效养分下降２３—２８％，土壤微生物数量和活性也大大降低．因此，杉木纯林连栽经营方式应尽快改变．
In the same forest area with three different types of Chinese fir even times the number of soil, fir seedling pot test. The results showed that continuous planting of Cunninghamia lanceolata trees did not benefit their saplings growth. Reproduction of sapling height growth decreased 37-40%, 19-28% reduction in base diameter, crown width decreased 21-29%, total biomass decreased 45-50%. Cunninghamia lanceolata has also caused soil nutrient decline, that is, 7-28% reduction in humus, 23-28% reduction in available nutrients, soil microbial quantity and activity is greatly reduced. Therefore, the fir plantation Lianzao operating mode should be changed as soon as possible.